Taking damage but no damage sound?

Explanation:

When fighting enderman in the nether this has already happened multiple times, I block his attack then he runs behind me doing damage but no damage sounds.

(Visible on attached video)

Envinroment:

Difficulty: normal Render distance: 12 Chunks

Dimension: Nether Biome: Warped Forest

Version: 1.16.1 Vanilla